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• LambdaScope.java

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tk.hongkailiu.test.app.java8.lambda.scope.LambdaScope Maven / Gradle / Ivy

package tk.hongkailiu.test.app.java8.lambda.scope;

import java.util.function.Consumer;

/**
 * Created by hongkailiu on 2015-04-25.
 */
public class LambdaScope {

    public int x = 0;


    class FirstLevel {

        public int x = 1;

        void methodInFirstLevel(int x) {

            // The following statement causes the compiler to generate
            // the error "local variables referenced from a lambda expression
            // must be final or effectively final" in statement A:
            //
            // x = 99;

            Consumer myConsumer = (y) -> {
                System.out.println("x = " + x); // Statement A
                System.out.println("y = " + y);
                System.out.println("this.x = " + this.x);
                System.out.println("LambdaScope.this.x = " + LambdaScope.this.x);
            };

            myConsumer.accept(x);

        }
    }

}